fix(curriculum): update minimum questions from 17 to 18 (freeCodeCamp#59319)

Author: Anshik-18

tools/challenge-helper-scripts/helpers/get-challenge-template.ts

@@ -76,7 +76,7 @@ const getQuizChallengeTemplate = (
 
 # --description--
 
-To pass the quiz, you must correctly answer at least 17 of the 20 questions below.
+To pass the quiz, you must correctly answer at least 18 of the 20 questions below.
 
 # --quizzes--